[Malignant fibrous histiocytoma of the urinary bladder: a case report].

A case of malignant fibrous histiocytoma (MFH) of the urinary bladder was presented. A 59-year-old man visited our hospital with a chief complaint of gross hematuria with clots. Intravenous urography revealed a filling defect on the left side of the bladder. CT scan demonstrated that the tumor invaded the bladder wall deeply. The histology of the biopsy specimens obtained by TUR was suspected to be transitional cell carcinoma. Bleeding from the bladder was so severe that a lot of units of blood transfusion were required in order to compensate for anemia before total cystectomy was performed. The tumor was hemispheric, moderately demarcated, measuring 5.5 cm x 4.0 cm x 5.5 cm, and located at the posterior wall. The histological diagnosis was malignant fibrous histiocytoma, inflammatory type, with venous invasion of tumor cells. Postoperatively, the patient received 5 courses of combination chemotherapy of adriamycin (100 mg/body, day 1) and dacarbazine (400 mg/body, day 1-5). He is alive with no evidence of local and metastatic disease 24 months after operation, in spite of the poor prognosis predicted from the histological findings. MFH of the urinary bladder is very rare. We also made a brief review of prior reports on this disease.